Cycloalkanes for AQA GCSE Chemistry
This page covers the following topics:
1. Formulae and solubility
2. First five
3. Molecular formula
Cycloalkanes are hydrocarbons that consist of a ring of carbons with single carbon-carbon bonds. As they contain only carbon and hydrogen they are also not very soluble in water. They generally have slightly higher boiling points than alkanes.
The first 4 clycloalkanes have a different number of carbons to the first 4 alkanes as there MUST be a carbon ring. The minimum number of carbons needed to complete a ring is 3.
Molecular formula shows the number and type of atoms present in a molecule, remember that for alkenes they will follow the general formula from before.
What is the general formula of cycloalkanes?
What is the name of the cycloalkane with the shortest possible carbon chain (the first cycloalkane)?
There must be at least 3 carbons to form a ring, thus it will have 3 carbon atoms.
What is the molecular formula of cyclohexane?
The boiling point point of pentane is 36°C, estimate what the boiling point of cyclopentane is.
49°C (accept anything between 37° and 67°C)
How does solubility of cycloalkanes change with chain length?
Shorter cycloalkanes are slightly more soluble than longer chain alkenes
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